Valve assembly

Details Valve assembly Valve assembly

E - Fixed Constructions

21

B

E21B 34/08 (2006.01) E21B 23/00 (2006.01) E21B 23/06 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2408906

An apparatus usable in a subterranean well includes a valve (10), a first mechanism (28) and a second mechanism. The valve (10) controls communication between an annular region (9) that surrounds the valve (10) and an inner passageway (18) of the valve (10). The first mechanism causes the valve to transition from a first state to a second state in response to pressure in the annular region. The second mechanism causes the valve (10) to transition between the first state and the second state in response to a pressure differential between the annular region (9) and the inner passageway (18).

L'invention concerne un appareil destiné à être utilisé dans un puits souterrain comprenant une vanne (10), un premier mécanisme (28) et un second mécanisme. La vanne (10) commande des communications entre une région annulaire (9) qui entoure la vanne (10) et un passage interne (18) de la vanne (10). Le premier mécanisme contraint la vanne à effectuer une transition entre un premier état et un second état en réponse à une pression présente dans la région annulaire. Le second mécanisme contraint la vanne (10) à effectuer une transition entre le premier et le second état en réponse à une pression différentielle présente entre la région annulaire (9) et le passage interne (18).

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